The Official Calendar of the Republic is a project by the Presidential Communications Development and Strategic Planning Office that features historical events and official observances per calendar day of the year. These events range from birth/death anniversaries of prominent historical figures (e.g., previous presidents/vice-presidents, national artists/scientists, etc.), to dates regarding official proclamations. The book also features essays for every month detailing a specific historic event relevant to that particular month. Given the calendar’s attempt at a daily account of past events that have shaped the Philippine Republic, it is not just a calendar for any single year, but it serves as a general reference that chronicles the development of the Philippine government.